$VAR1 = {
          'records' => [
                         {
                           'alloc_pg' => '',
                           'extent_id' => '608',
                           'oampg' => '600'
                         },
                         {
                           'alloc_pg' => '',
                           'extent_id' => '616',
                           'oampg' => '128'
                         }
                       ]
        };
[% FOREACH records %]
[% ... %]
 OAMPG: [% oampg %]   Extent ID [% extent_id %] on allocation page [% alloc_pg %]
[% END %]